Getting Active Directory user account of a particular domain

So you can implement the same like below:

#1 Use FetchEntites Step for Account datastructure\Table(Select the Type name as Account), here you'll get all the Accounts.

#2 In that, use the Fetch Criteria as the authenticationType contains "ActiveDirectory" and emailAddress contains "@decisions.com"(enter here the domain of which you want to get the users), here based on criteria you'll get the AD accounts with respect to there domain.